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| author | Max Reitz <mreitz@redhat.com> | 2013-09-03 10:09:51 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2013-09-12 10:12:46 +0200 |
| commit | e7108feaace8e02b3a4bf010448fc2744f753381 (patch) | |
| tree | bc31fa3048d8914a83ae39f2fcdb640bc64cd630 | |
| parent | 6f176b48f9f98820ed192a1355cc1c7c08ddf46b (diff) | |
| download | qemu-e7108feaace8e02b3a4bf010448fc2744f753381.tar.gz | |
qcow2-cache: Empty cache
Add a function for emptying a cache, i.e., flushing it and marking all
elements invalid.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
| -rw-r--r-- | block/qcow2-cache.c | 18 | ||||
| -rw-r--r-- | block/qcow2.h | 2 |
2 files changed, 20 insertions, 0 deletions
diff --git a/block/qcow2-cache.c b/block/qcow2-cache.c index 7bcae09a69..40a5a3fc39 100644 --- a/block/qcow2-cache.c +++ b/block/qcow2-cache.c @@ -202,6 +202,24 @@ void qcow2_cache_depends_on_flush(Qcow2Cache *c) c->depends_on_flush = true; } +int qcow2_cache_empty(BlockDriverState *bs, Qcow2Cache *c) +{ + int ret, i; + + ret = qcow2_cache_flush(bs, c); + if (ret < 0) { + return ret; + } + + for (i = 0; i < c->size; i++) { + assert(c->entries[i].ref == 0); + c->entries[i].offset = 0; + c->entries[i].cache_hits = 0; + } + + return 0; +} + static int qcow2_cache_find_entry_to_replace(Qcow2Cache *c) { int i; diff --git a/block/qcow2.h b/block/qcow2.h index 49eed828c5..35c822b8a6 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -478,6 +478,8 @@ int qcow2_cache_set_dependency(BlockDriverState *bs, Qcow2Cache *c, Qcow2Cache *dependency); void qcow2_cache_depends_on_flush(Qcow2Cache *c); +int qcow2_cache_empty(BlockDriverState *bs, Qcow2Cache *c); + int qcow2_cache_get(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset, void **table); int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset, |